Grinding machine



June 129, 19 23., 1,459,569

' L. W. BUGBEE GRINDING MACHINE Filed Nov. 5, 1919 INVENTOR LUCIAN W B UGBE E ATTORNEYS Y Patented June 19, 1923.

UNITED STATES PATENTV'OFFICEQVNJ" LUCIAN w. IBUGBEE, 0F INnIAnAroLIs, INDIANA, Assrenon TO AMERICAN OPTICAL COMPANY, OF SOUTHBRIDGE, MASSACHUSETTS.

MASSACHUSETTS, VOLUNTARY ASSOCIATION OF- GRINDING MACHINE.

Application filed November 5, 1919. Serial No. 335,868.

T 0 all whom it may, concern.

Be it known that I, LUCIAN W. BUGBEE, a citizen of the.United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Grinding Machines, of which the following is a specification. I i

This invention relates to new and useful improvements in polishing or grindlng machines, and more particularly to what Wlll be known as a bifocal lens polisher', the main object of the present invention being the provisionof a device of the above character whereby the segment of a bifocal lens can be readily polished to a finished condition without having a tit in the center of the segment.

Another object of "the present invention is the provision of a'lens grinding or polishing machinewherein the polishing is accomplished through the medium of two rotating objects adapted to rotate in opposite directions and having the meeting edges overlapped in the center of the segment, while the edges thereof will extend to the extreme edge of the segment in the lens being polished, whereby theentire area of the segment is covered by the two polishing objects so as to provide for a uniform. polishing over the entire segment j A still further object of the invention is the provision of means for supporting the polishing devices whereby they may be readily adjusted so as to accommodate themselves to various thicknesses of segment and for either concave or convex'lenses.

a With the above and other objects inv view the invention consists in the novel features of construction, the combination and arrangement of parts hereinafter more fully set forth, pointed out in the claims and shown in the accompanying drawings in which: v

Figure I is a "side elevation of a portion of a polishing or grindingmachine including my improvement, parts thereof being broken away and illustrated in cross section.

Figure II is a detail sectional viewillustrating the connection between the polishingpads and the driving mechanism. Figure III is a detail sectional view taken on the line 'III II'I of Figure I;

Figure IV is a face view of the retaining plate which assists in holding one of the polishing discs in position.

Figure V is a vertical sectional view of the bar adjustment. 7

Figure VI represents a plan view of my improved polishers in use on a bifocal lens.

Referring now more particularly to the 1 drawings, the numeral 1 indicates the main spindle orsupporting shaft of the polishing machine and attachedthe-reto is a pulley 2 which is driven through the medium of a belt 3 applied to any well known source for imparting movement to the pulley 2. Ap plied to the upper end of the shaft 1 is the usual lens support orlap j'whichiin the present instance is illustrated as adapted for the reception of concave lenses, said lap being provided with the usual socket 5adapted to fit over the upper end of the .-'-shaft 1 whereby to removably retain the lap in position thereon so that it can be readily exchanged for different size laps. j

Secured in any well known manner to the upper face of the lap 4c is thelens 6, which in the present instance is in the form of a these discs are rotated in opposite directions; 7

over the face of the segment 7, the polishing will be uniformover the entire face of the segment as the teeth meshing in the center of the segment will prevent the usual tit from being formed' and thus provide for uniform grinding over the face of the segs ment. r

As illustrated in Figure I the gear shaped polishing disc 9 is positively driven through the medium of the upright shaft 10, which is connected by means of thepulley 11, to

any source of ower desired, and, supported in position by means of the brackets 12. The lower end of the shaft 10 is provided with the angular finger 13 which engages with I upon rotation of the shaft 10 the disc 9 will be positively driven therewith.

lVhile the disc Qhas been illustrated and described as positively driven through the nie'diunrof the shaft 10, the disc Sis suitably retainedin position so that the teeth thereon will mesh with the teeth on the disc 9 approximately over the center of the'segment being grounch and in order to retain the'disc 8 inits proper position I provide a pin 16,

' the lower end of which engages within a' socket 17 formed in the upper face of the disc p8jjwhile the upper fend is extended through an opening in a ball member 181and adji'istably retained in position by means ofthe set'screw 19} which extends through the" outer surface of the ball 18 and engages with the pin 16.", It will be noted that. this ball 1 8is laterally adjustable'and as'the pin 1'6Iis" adjustable longitudinally the disc 8 can be readily shifted to various desired po-' sitions that is it can be readily shifted into or out of engagement with the teeth on the disc 9 when it is desired to change the .lens6,

-'In supporting thepin 16 in its operative positionI provide a bracket, 20 which ex- 7 tends out from {the lower end of the supp'ortingshank 21 upon the side opposite the brackets 12, and formed within the'bracket I 20 isa slotu22 having disposed therein a bolt 23 one end of which is headed as at 24; 'whilethe' other end, is provided with screw threads adapted to engage in the shank 25 formed on the ball member 18, and inorder to retain the ball member 18 inits various adjusted positionsI provide a plate 26 having "aniinternal threaded shank portion 27 which is adapted to engage with thebolt 23, and as the upper face of the plate-26 is corrugated to correspond with the lower corrugated face of the shank 25, 1t will'be noted that when the shank 25 is tightened down onto thenpperface of the plate'26 the ball member 18 will be securely held in any position to which it has been adj uste'd. Fromthis' it' will be apparent. that the pin 16 can 'bereadily adjusted either laterally or longitudinally to permit of shifting of thepolishing disc 8. I

v In order to provide for the polishing of the,difl'er'ent segments which it is understood are placed in different positions, in the var ous makes of lenses, the standard ismountedfor swinging and lateral adu stment upon the main supporting bracket 28, and 'it will be apparent that upon shiftng the standard 21 the polishing discs can be readily arranged in various positiens with respect to the segment in the lensbelng polished. It will be understood, however, that this adjustment can'be made in various ways and must be so arranged that 1 the polishing discs can be quickly and. readily changed when deslred.

As will be noted in the accompanying drawings, the lens blank 6 will be positively driven and should run relatively slow while the discs 8' and 9 will be driven at a ,relatively high rate of speed, and as the discs are running in opposite directions the rougeor grinding material will be forced toward the center of the grinding movement in-.

stead of moving outwardly onto-the main 1 lens 6. I It will be noted that by having the two discs 8 and 9', one positively driven and the other driven through the moveinent of this discin'the opposite direction, it will result in a more complex mo'veme'nt than can be obtained with a singledisc, and as the teeth formed on the discs 8 and 9'over lap at the center of the segment there will be no chance togenerate a tit in the center of the segment, as usuallybccurs with a single grinding disc.

While .I have shown and described only one of the discs as positively'driven, 'it wi ll be understood that arrangements can be made whereby fboth of the discswill be positively driven, thus giving more power to the grinding operation. v

From the; description as given ab'oye' it will be apparentthatin the operation of my improved device the lens 6 is first placed within 'the lap 4 and-the discs 8 and .9 placed in position over the segment 7 'The shaft 21 is then lowered until the lower ends of the shaft 10 and pin 16 are engaged withinthef openings 14 and 17 in the center of the discs. The angular finger 13 is also engaged with a socket 15 so: as to impart movement to the two discs through theme.- dium of the one disc 9. It, will be apparent that this raising and lowering of the shaft21 can be carried on through the mem ber 28. It will. be noted that the disc 8 can be readily adjusted toward or away from the disc 9 and moved in various positions by theadjustment of the pin 18.

While I have shownvand described the 1 main featureof this invention as operating upon a concave lens it will heapparent, as illustrated in Figure V that the device can be used equally as well in polishing or grind ing a convex lens, it only being necessary to change the shape ofthe polishing discs ing block 31 adjusted upon the slot 22 and ,retained in various adjusted positions by means of the set screw 32. From this it will be apparent that the pressure on the discs 8 and 9 can be Varied through the adjusting of the tension of the spring 29.

I claim:

1. A machine of the character described, including a pair of polishing disks each having toothed edges extending to the lens engaging faces thereof, and means for supporting the disks with the toothed edges in interlocking engagement one with the other.

2. A device of the character described, including a pair of disks having interfitting polishing surfaces, cone points engaging said disks to retain them in interfitting engagement but permit of relative movement thereof, and means for positively rotating one of the disks.

3. In a machine of the character described, the combination with a lens block spindle, of an angularly adjustable frame opposed thereto, a driven spindle carried by the frame and angularly adjustable therewith, a supplemental spindle carried by the frame and angularly adjustable therewith and with respect thereto, and interengaged lens grinding members carried by the tWo spindles of the frame.

4. A substantially cylindrical lens pol-v ishing member having the periphery of the polishing surface formed with indentations and projections, substantially as illustrated.

5. In a machine of the character described, the combination with an angularly adjustable head, of an offset crank bearing spindle carried by the head, a gear shaped polisher carried by the spindle, a pin carried by the head, and a second gear shaped polisher meshing with the first and retained in rotatable engagement therewith by the p1n.

In testimony whereof I have aflixed my signature, in presence of this witness.

LUCIAN W. BUGBEE. Witness:

JULIA H. WELLS. 

